JP5502844B2 - Valve-type writing instrument - Google Patents

Description

  The present invention relates to a valve-type writing instrument, and more particularly to a writing instrument such as a direct liquid type marker provided with a valve mechanism, and the valve is opened by pushing the lead into the pen shaft, and ink is supplied to the ink reservoir. In addition, the present invention relates to a valve-type writing instrument that allows ink to soak into the core in the ink storage section.

  Writing tools such as markers are roughly classified into a batting type in which a batting with ink impregnated in the shaft is loaded and a direct liquid type (raw ink type) in which ink is directly injected into the shaft. As a conventional marker, there were many batting type, but in the case of the batting type, if the tip of the core dries up, it takes time for the ink to soak up to the state where writing is possible again, and when writing quickly, There is a drawback that the written letters are drawn because the ink penetration cannot catch up. On the other hand, in the case of the direct liquid type, since the lead is in direct contact with the ink stored in the ink tank shaft and the ink soaks quickly, the tip of the lead does not dry, and even when writing quickly Since penetrating follows this, handwritten characters are never drawn, so recently, direct liquid type has become mainstream.

  By the way, in the case of the direct liquid type, the ink oozes out excessively to the core and a so-called ink drop phenomenon may occur, so the ink is applied to the core via a valve mechanism that is opened by pushing the core. There are many valve type soaking. However, even in that case, the air in the shaft thermally expands to hold the ink tank shaft during writing, or the pressure in the shaft rises due to the gripping pressure or atmospheric pressure, resulting in excess in the core. The ink may ooze out and the ink may fall off. Therefore, conventionally, a method has been adopted in which an absorption ring made of a foamed resin is fitted to the inner end of the core, and excess ink is absorbed by the absorption ring to avoid ink drop.

  However, in the case of this conventional valve type mechanism using an absorption ring, since the portion of the core that contacts the ink is only the inner end portion, the core is easily dried and writing curl is likely to occur. For this reason, there is an inconvenience that the valve opening operation by pushing in the lead must be frequently performed. Further, since the lead pushing operation is frequently performed, the tip of the lead is easily damaged, and there is a problem that even if a large amount of ink remains, it cannot be used.

JP 2008-6668 A JP 2008-87422 A JP 2008-155484 A Utility Model Registration No. 2594306

  As described above, in the case of a conventional valve type mechanism using an absorption ring, there is an inconvenience that the valve must be opened frequently by pushing in the lead, and the push-in operation of the lead is frequently performed. In addition, the tip of the lead is easily damaged, and there are many problems that it becomes impossible to use even though a large amount of ink remains.

  Therefore, the present invention does not have such a problem. That is, since many parts of the lead are always in contact with the ink to prevent the lead from drying, the valve is frequently opened by pushing the lead. There is no early damage to the nib due to frequent operation, and the ink soaks quickly into the nib, so there is no curl of written characters even in high-speed writing. An object is to provide a valve-type writing instrument.

The invention described in claim 1 for solving the above-described problems is an ink tank shaft, a valve housing cylinder fitted into a front end opening of the ink tank shaft, and slidable on the valve housing cylinder. Consisting of a held core,
In the valve housing cylinder, a core insertion cylinder into which the rear half of the core is slidably inserted in order from the front end side and an outer peripheral surface of the core insertion cylinder are arranged at narrow intervals over the entire length thereof. An ink storage member configured to allow ink introduced into the core insertion cylinder to flow out between the annular plates, and a valve mechanism for controlling ink supply. And a valve unit case in which the top surface is in contact with the bottom surface of the ink storage member, and the bottom surface opening is closed by a lid member having an ink flow hole for allowing the ink in the ink tank shaft to always flow. ,
The valve mechanism is opened when the core is pushed in, and the ink introduced into the valve unit case through the ink flow hole is supplied into the ink storage member, and is supplied into the ink storage member. The ink flows out from the core insertion cylinder between the annular plates, fills the ink storage space between the annular plates and the inner peripheral surface of the valve housing cylinder, and is stored there. A valve-type writing instrument characterized in that a portion can penetrate into the core entering the core insertion cylinder.

In one embodiment, by forming a vertical groove in the core insertion cylinder so that the vertical groove opens between the annular plates, the ink introduced into the core insertion cylinder is discharged from the opening through the opening. It flows out to the ink storage space.

  In one embodiment, the annular plate group of the ink storage member has a loosely tapered shape that shrinks toward the rear end, and in another embodiment, the inner peripheral surface of the valve housing cylinder faces toward the front end. It is made into a loose taper shape that shrinks.

  In one embodiment, the valve mechanism incorporated in the valve unit case includes a valve body that opens and closes an ink outlet on the upper surface of the valve unit case, and urges the valve body to always close the ink outlet. And return spring.

  According to the valve-type writing instrument of the present invention, the latter half of the lead is contained in the lead insertion cylinder for storing ink in the surrounding portion (between the annular plates) and is always in contact with the ink. Therefore, it is not necessary to frequently open the valve by pushing in the lead, preventing early damage to the lead due to frequent operation, and ink soaking during high speed writing Since it becomes quick, there is an effect that the writing character is not distorted.

  Furthermore, even if an internal pressure change occurs in the ink tank shaft, the valve mechanism functions to prevent the ink from flowing into the ink storage cylinder, so that the ink drops due to the internal pressure change in the ink tank shaft. There is an effect to prevent.

It is a front view of one embodiment of a valve-type writing instrument according to the present invention. It is a principal part expanded sectional view of one Embodiment of the valve-type writing instrument which concerns on this invention (at the time of a core non-pressing). It is a principal part expanded sectional view (at the time of core pushing) of one Embodiment of the valve-type writing instrument which concerns on this invention. It is a disassembled perspective view of one Embodiment of the valve-type writing instrument which concerns on this invention. It is the front view and longitudinal cross-sectional view which show the structure of the valve | bulb accommodation cylinder in the valve-type writing instrument which concerns on this invention. It is the front view, side view, and longitudinal cross-sectional view which show the structural example of the ink storage member in the valve-type writing instrument which concerns on this invention. It is the front view, side view, and longitudinal cross-sectional view which show the other structural example of the ink storage member in the valve-type writing instrument which concerns on this invention. It is the front view and longitudinal cross-sectional view which show the structure of the valve unit case in the valve-type writing instrument which concerns on this invention. It is the front view and longitudinal cross-sectional view which show the structure of the cover member in the valve-type writing instrument which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of an embodiment of a valve-type writing instrument according to the present invention, FIGS. 2 and 3 are longitudinal sectional views thereof, and FIG. 4 is an exploded perspective view thereof. The valve-type writing instrument includes an ink tank shaft 1, a valve housing cylinder 2 fitted to the tip portion of the ink tank shaft 1, and a tip portion slidably supported by the tip diameter-reduced portion 3 of the valve housing tube 2. The core 4 is held by the valve housing cylinder 2 so as to protrude from the tip diameter-reduced portion 3 and a cap (not shown). In the following description, the writing instrument front end side (left side in the figure) of each component is the top surface, and the writing instrument rear end side of each component is the bottom surface (or bottom surface).

An ink storage member 5 and a valve unit case 6 are loaded into the valve housing cylinder 2 in order from the tip side. The ink storage member 5 extends in the center of the substrate 7 and is inserted into the core insertion cylinder 8 into which the rear half of the core 4 is slidable. (See FIGS. 6 and 7), and the ink introduced into the ink storage member 5 as described later is disposed between the gaps between the annular plates 9 and the valve housing. The ink storage space 11 surrounded by the inner peripheral surface of the cylinder 2 is filled.

  In order to make the ink fill the ink storage space 11, in one embodiment, one or more vertical grooves 10 are formed in the core insertion cylinder 8, and the vertical groove 10 forming portion is interposed between the annular plates 9. It is made to open (refer FIG.6 (D) and FIG.7 (C)). In the case of this configuration, the ink that has come out of the ink outlet 12 that is opened on the upper surface of the valve unit case 6 enters the vertical groove 10 and goes up from the openings between the annular plates 9 while rising in the vertical groove 10. The ink storage space 11 is filled. In that case, a part of the ink introduced into the longitudinal groove 10 soaks into the core 4 which is housed in the core insertion cylinder 8 in the latter half.

  FIG. 7 shows another embodiment of the ink storage member 5. In this embodiment, the inner diameter of the rear half of the core insertion cylinder 8, that is, the part in which the opening / closing piece 12 described later is accommodated is the inner diameter of the front half. It is formed in a larger diameter than.

  The diameter of each annular plate 9 of the core insertion cylinder 8 is formed corresponding to the inner diameter of the valve housing cylinder 2 so that the substrate 7 is in close contact with the inner peripheral surface of the valve housing cylinder 2. And in one Embodiment, the annular plate 9 is formed in the loose taper shape which diameter-reduces toward a rear end (refer FIG. 6). By doing so, the gap with the inner peripheral surface of the valve housing cylinder 2 is expanded toward the rear end, so that the ink storage space 11 is expanded, and conversely, the front end side is the inner periphery of the valve housing cylinder 2. Ink is less likely to leak close to the surface. Further, as in the embodiment shown in FIG. 7, the same effect can be obtained by making the diameters of the annular plates 9 uniform and forming the inner peripheral surface of the valve housing cylinder 2 in a loosely tapered shape.

  Since the ink storage member 5 has the above-described configuration, the ink delivered from the valve unit case 6 flows into the longitudinal groove 10 of the core insertion cylinder 8 and soaks into the core 4, and excess ink is introduced from the opening of the longitudinal groove 10. The ink flows out into a narrow gap between the annular plates 9, fills the ink storage space 11, and is stored therein. Then, the ink stored in the ink storage space 11 soaks into the core 4 whose latter half is accommodated in the core insertion cylinder 8 as needed.

  In the valve unit case 6, a valve body 13 that opens and closes an ink outlet 12 that is opened on the upper surface thereof, and a return spring 15 that constantly biases the valve body 13 so as to close the ink outlet 12 are incorporated ( 2 and 3). The valve body 13 includes an opening / closing piece 14 having a tapered valve seat abutting portion at the bottom and a support portion 14a for receiving the opening / closing piece 14. The upper portion of the opening / closing piece 14 projects from the ink outlet 12 during assembly. Then, it enters the second half of the core insertion cylinder 8 in a slidable state (see FIGS. 2 and 3). Further, the support portion 14a is formed with a flange portion 14b projecting laterally, and a stopper 14c is continuously provided on the flange portion 14b. As will be described later, the stopper 14c serves to regulate the pushing end of the core 4.

  The valve body 13 is always pushed up by the return spring 15 when there is no load, and the valve seat abutting portion of the opening / closing piece 14 abuts on the valve seat on the inner edge of the ink outlet 12 to close the ink outlet 12 (see FIG. 2). When the lead 4 is pushed against the push-up force of the return spring 15, the opening / closing piece 14 is pushed by the inner end surface of the lead 4, and the valve seat abutting portion is separated from the valve seat at the inner edge of the ink outlet 12. The ink outlet 12 is opened (see FIG. 3). By opening the ink outlet 12 in this way, the ink stored in the valve unit case 6 flows into the vertical groove 10 of the core insertion cylinder 8 through the ink outlet 12.

  The bottom surface of the valve unit case 6 that is open on the entire surface is closed by a lid member 16 having an ink flow hole 17 through which the ink in the ink tank shaft 1 always flows into the valve unit case 6 (FIGS. 2 and 3). , 8). Usually, a plurality of ink flow holes 17 are formed so as to surround a support hole 18 formed at the center of the lid member 16. The upper surface of the return spring 15 is supported by being in contact with the rear surface of the flared portion of the opening / closing piece 14 of the valve body 13, and the lower surface is supported by being in contact with the lid member 16. Further, the lower portion of the support portion 14 a of the valve body 13 is slidably inserted into a support hole 18 formed in the center portion of the lid member 16. The stopper 14c regulates the pushing end of the lead 4 by hitting the upper edge of the support hole 18 when the lead 4 is pushed (see FIG. 3).

  The bottom surface of the valve unit case 6 extends outward to form a flange 19. The valve unit case 6 is inserted into the valve housing cylinder 2 until the flange 19 abuts the lower end of the valve housing cylinder 2. The At that position, the upper surface abuts against the bottom surface of the ink storage member 5, and the ink outlet 12 is in communication with the core insertion hole 8 (see FIGS. 2 and 3).

In the above-described configuration, the ink in the ink tank shaft 1 flows through the ink flow hole 17 of the lid member 16 freely by its own weight and flows into the valve unit case 6 by filling the core 4 downward. . The ink that has entered the valve unit case 6 remains there until the core 4 is pushed into the valve housing cylinder 2 and the ink outlet 12 is opened. Then, the core 4 is pushed into the valve housing cylinder 2 and the ink outlet 12 is opened, and at the same time, the ink flows into the ink storage member 5 (FIG. 3). The ink storage space 11 between the narrow gap between 9 and the inner peripheral surface of the valve housing cylinder 2 is filled, and the core 4 is soaked as needed.

  Thus, in the writing instrument according to the present invention, the latter half portion of the lead 4 is always contained in the lead insertion cylinder 8 surrounded by the ink storage space 11 for storing ink, and the ink can be absorbed at any time. Therefore, the core 4 is prevented from drying. Therefore, it is not necessary to frequently perform the opening operation of the valve by pushing in the lead, and early damage to the lead due to the frequent operation is prevented. In addition, even when writing at high speed, since ink soaks quickly, writing characters are less likely to be drawn.

  Although the invention has been described in some detail with its most preferred embodiments, it is evident that a wide variety of embodiments can be constructed without departing from the spirit and scope of the invention. Accordingly, the invention is not limited to that particular embodiment, except as limited in the claims.

DESCRIPTION OF SYMBOLS 1 Ink tank axis | shaft 2 Valve storage cylinder 3 Reduced diameter part 4 Core 5 Ink storage member 6 Valve unit case 7 Substrate 8 Core insertion cylinder 9 Annular plate 10 Vertical groove 11 Ink storage space 12 Ink outlet 13 Valve body 14 Opening / closing piece 14a Support portion 14b Hook portion 14c Stopper 15 Return spring 16 Lid member 17 Ink flow hole 18 Core insertion hole 19 Flange

Claims (5)

An ink tank shaft, a valve housing cylinder fitted into a front end opening of the ink tank shaft, and a core slidably held in the valve housing cylinder,
In the valve housing cylinder, a core insertion cylinder into which the rear half of the core is slidably inserted in order from the front end side and an outer peripheral surface of the core insertion cylinder are arranged at narrow intervals over the entire length thereof. An ink storage member configured to allow ink introduced into the core insertion cylinder to flow out between the annular plates, and a valve mechanism for controlling ink supply. And a valve unit case in which the top surface is in contact with the bottom surface of the ink storage member, and the bottom surface opening is closed by a lid member having an ink flow hole for allowing the ink in the ink tank shaft to always flow. ,
The valve mechanism is opened when the core is pushed in, and the ink introduced into the valve unit case through the ink flow hole is supplied into the ink storage member, and is supplied into the ink storage member. The ink flows out from the core insertion cylinder between the annular plates, fills the ink storage space between the annular plates and the inner peripheral surface of the valve housing cylinder, and is stored there. A valve-type writing instrument characterized in that a portion can penetrate into the core entering the core insertion cylinder. By forming a vertical groove in the core insertion cylinder so that the vertical groove opens between the annular plates, ink introduced into the core insertion cylinder can flow out from the opening into the ink storage space. The valve-type writing instrument according to claim 1.   The valve-type writing instrument according to claim 1 or 2, wherein the annular plate group of the ink storage member has a loosely tapered shape that shrinks toward the rear end.   3. The valve-type writing instrument according to claim 1, wherein an inner peripheral surface of the valve housing cylinder has a loose taper shape that shrinks toward a tip. The valve mechanism incorporated in the valve unit case includes a valve body that opens and closes an ink supply port on the upper surface of the valve unit case, and a return spring that constantly urges the valve body to close the ink supply port. The valve-type writing instrument according to any one of claims 1 to 4 .

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